BELT TENSION
Adjustment of serpentine belt is not necessary. Belt tension is maintained by spring-tensioned idler pulley (some equipped with belt wear indicator).
ENGINE COMPRESSION
| Application | Specification - psi (kPa) |
|---|
| Normal Compression Pressure | (1) |
| Minimum Compression Pressure | (1) |
| Compression Variance | (2) |
| (1) Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (689.5 kPa). (2) Information is not available from manufacturer. |
| (1) | Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (689.5 kPa). |
| (2) | Information is not available from manufacturer. |
ENGINE COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Engine is equipped with hydraulic lifters. Adjustment is not required.
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| All Models | 1000 Per Ft. |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Type | Part No. |
|---|
| All Models | AC | 25171803 |
| NGK | 12567759 |
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|
| All Models | Iridium .040 in. (1.04 mm) Platinum .060 in. (1.52 mm) | Tighten to 15 ft. lbs. (20 N.m) when using NEW cylinder head. Tighten to 11 ft. lbs. (15 N.m) for all subsequent installations. |
SPARK PLUG SPECIFICATIONS
Scheme 4
IGNITION TIMING
All models are equipped with an electronic computer-controlled ignition system. Ignition timing is not adjustable.
FUEL PUMP
| Application | Psi (kPa) |
|---|
| Bi-Fuel Engines (1) | (2) 130-200 (826-1379) |
| CNG Engines | (3) 110-210 (758-1448) |
| Gasoline Engines | 55-62 (379.2-427.5) |
| (1) Bi-fuel engines are equipped with a gasoline and a CNG injector on each cylinder. (2) Pressure reading as shown under FRP display on a scan tool. (3) Pressure checked at Intermediate Pressure Regulator (IPR) test port using CNG Electronic Pressure Gauge Kit (J-39970). |
| (1) | Bi-fuel engines are equipped with a gasoline and a CNG injector on each cylinder. |
| (2) | Pressure reading as shown under FRP display on a scan tool. |
| (3) | Pressure checked at Intermediate Pressure Regulator (IPR) test port using CNG Electronic Pressure Gauge Kit (J-39970). |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| Bi-Fuel & CNG Engines (2) | 1-2 |
| Gasoline Engines | 11-14 |
| (1) Injector resistance specification is at 50-95°F (10-35°C). (2) Bi-fuel engines are equipped with a gasoline and a CNG injector on each cylinder. |
| (1) | Injector resistance specification is at 50-95°F (10-35°C). |
| (2) | Bi-fuel engines are equipped with a gasoline and a CNG injector on each cylinder. |
INJECTOR RESISTANCE SPECIFICATIONS (1)
IDLE SPEED & MIXTURE
Note. Idle mixture is controlled by Powertrain Control Module (PCM). Idle speed is preset by manufacturer and is not adjustable.
THROTTLE POSITION SENSOR
Note. Throttle Position (TP) sensor is not adjustable. For further testing procedures, perform TP sensor related diagnostic test. See appropriate SELF-DIAGNOSTICS article.
Note. Vehicles equipped with CNG engines are not equipped with a TP sensor.
| Application | (1) Voltage |
|---|
| All Gasoline Engines | 1.0-4.0 |
| (1) Voltage range is from idle to wide open throttle. |
| (1) | Voltage range is from idle to wide open throttle. |
THROTTLE POSITION SENSOR VOLTAGE
